研究目的

Investigating the therapeutic effects of a specific herbal medicine on a particular disease.

研究成果

Gd:CdTe QDSSC with polysulfide electrolyte was fabricated and its photovoltaic performance was analyzed. Pure and Gd:CdTe QDs were successfully synthesized in aqueous phase. Structural and optical behaviors of the prepared QDs were studied under different dopant concentrations. Powder XRD analysis confirms the cubic zinc blende crystalline structure of prepared QDs. It also confirms that the mean crystallite size was increased with dopant concentration in the range between 2.1 nm and 4.2 nm. Band gap energy variation with dopant concentration was estimated by UV-vis absorption spectral analysis. Fluorescence QE result reveals that the doping concentration favors fluorescence behavior of CdTe QDs. Highest QE of 67% was achieved for 10% Gd doping. The weak fluorescence behavior at higher doping concentration was due to fluorescence quenching. The variations in COO- stretching vibrations of MSA molecules confirm the effective capping of MSA molecules over the prepared QDs surface. TGA result reveals that the thermal stability of prepared QDs was significantly increased by Gd doping. The photovoltaic response of Gd:CdTe QDs was studied and the higher solar cell efficiency of about 2.24% was achieved for 10% of Gd doping. From the overall observations, we can conclude that the CdTe QDs with 10% of Gd doping will be used as the potential sensitizer for QDSSC.

研究不足

The solar cell efficiency of prepared QDs still low when compared with theoretical efficiency of QDSSC. It may be due to less active sites of TiO2 nanoparticles, which limits the QDs sensitization process.